Hi,
When did the problem begin? Based on your explanation, this seems to be a problem with the physical battery. Try shutting down your computer and then disconnect the power adapter from your laptop. If your laptop has a removable battery and you are comfortable doing so, remove it. Hold down the power button for 20 seconds to drain any residual power. After that, reinsert the battery, reconnect the power adapter, and turn on your laptop as usual. If the issue persists, try a different battery if available, or contact your PC manufacturer's support for possible replacement.